Programming When Replacing Transponder Key Electronic Control Unit & Hybrid Vehicle Control Electronic Control Unit
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
Once replacement transponder key Electronic Control Unit (ECU) and hybrid vehicle control Electronic Control Unit (ECU) are installed, register ignition keys to transponder key ECU. See IGNITION KEY REGISTRATION . Once ignition keys are registered, insert ignition key into ignition lock cylinder and start the engine.